AX3115 Datasheet | AXElite

PWM Control 3A Step-Down Converter  GENERAL DESCRIPTION AX3115 consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AX3115 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. An enable function, an over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. Also, an internal pensation block is built in to minimum external ponent count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L package, providing such outstanding Features as low current consumption. Since this converter can acmodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter.  Features Input voltage：4.5V to 23V Output voltage：1.222V to VCC Duty ratio：0% to 100% PWM control Oscillation frequency：380KHz typ. Current Limit (CL), Enable function. External Soft-Start function. Thermal Shutdown function. Short Circuit Protect (SCP). Built-in internal SW P-channel MOS. SOP-8L Pb-Free package. 1/7 Axelite Confidential Materials, do not copy or distribute without written consent. Rev.1.2 Aug.18, 2010  BLOCK DIAGRAM SW Oscillator Circuit PWM Switched Control Circuit Thermal Shutdown VEN Current Limit Vcc Reference Voltage + 4u A FB Vss  PIN ASSIGNMET The package of AX3115 is SOP-8L; the pin assignment is given by: Name ( Top View ) NC Vcc SW Vss 1 2 3 4 SOP-8L 8 7 6 5 SS EN NC FB Description Feedback pin Enable input, it is pull-high typically. Drive EN high or floating to turn on the regulator, driver it low to turn it...